JPH0889721A - Fluid circuit with main stream filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a device which is simple and cheap, and has high dependence by arranging the device for cutting off and/or regulating a min. stream pressure between a primary stream filter and a centrifuge. SOLUTION: A filter module consists of a housing 1, a primary filter 2 having a bypass valve 3, a oil cooler 4, a centrifuge supported by an upright shaft in a bypass stream, a min. pressure control valve and a combined valve 7 of a cut off valve. A piston 8 of the valve 7 receives loads of a pressure oil via a hole 9. A spring 10 which is given preliminary pressure acts against the pressure to degas from a hole 14. As the engine speed is raised, pressure is increased, and a piston opens an another side hole 12 and is transmitted to a zero pressure discharge cross section. By this process, a max. oil pressure is limited, the valve moves to the cut off position, and a volume flow supplied additionally is discharged from discharge cross section with zero pressure.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a mainstream filter,
In particular, it relates to a hydraulic fluid circuit having a centrifuge arranged in a sidestream.

[0002]

2. Description of the Prior Art Devices of this type are known and are used in the case of internal combustion engines, in particular for supplying purified lubricating oil to the engine.

The lubricating circuit of an internal combustion engine usually consists of components such as an oil pump, a cut-off valve or pressure regulating valve, an oil cooler, a mainstream filter with a bypass valve, a lubrication point, an oil stock in the engine oil sump and the like. Made of The cut-off valve has a function of cutting off the pressure that linearly increases as the engine speed increases at about 4 to 5 bar. The rising pressure also arises from an increase in the oil pump supply amount as the rotation speed increases. By terminating the pressure rise at said value, at the same time, the pump efficiency exhibited is also limited.

The disadvantage of this type of device is that the required oil purification is
It often fails to meet demand. In order to meet the demand, the filter area should be increased or the filter thickness should be increased, which increases the pressure loss. This is technically undesirable. This is because the pump efficiency must be increased.

[0005]

SUMMARY OF THE INVENTION The object of the present invention is therefore to improve a device of the type mentioned at the outset in order to produce a device which is simple, inexpensive and additionally reliable.

[0006]

This object has been achieved according to the invention by placing a device for the cutoff and / or regulation of the minimum fluid pressure between the mainstream filter and the centrifuge.

According to another feature of the invention, a minimum pressure cutout and adjustment is provided via a valve. This saves space and money.

Furthermore, it is advantageous if the valve has at least two offset holes. Also, one additional hole provides for venting of the valve opening into the pressureless chamber.

According to another advantageous configuration, the valve has a first bore connected to the centrifuge shaft via a fluid flow path.

Furthermore, the following configurations are advantageously possible. In other words, the centrifuge outlet is preferably connected to the fluid sump (oil sump) through the second hole via the return passage. The fluid reservoir is preferably provided within the centrifuge housing.

According to another advantageous design, the valve is arranged behind the mainstream filter. By doing so, it is possible to prevent a functional disorder due to dirt. The pressure drop due to fouling need not be addressed by increasing the cutoff pressure.

Furthermore, the valve can advantageously also be arranged in front of the mainstream filter. This makes it possible in particular to save space.

According to another advantageous design, the hollow rivet is designed as a nozzle in the centrifuge. This allows
For example, the flow loss caused by the punching flash can be prevented. This configuration is relatively inexpensive.

Furthermore, the following configurations are also possible advantageously: That is, it consists of a tube, preferably an elastomeric sealing plug 2
5 and / or the shaft 5, which preferably has an elastomeric ring 26, is inserted into the housing 1. This eliminates the threading that would otherwise be required without this configuration, and also eliminates the need for a separate manufacturing step due to the use of tubing, i.e. the oil supply holes.

According to another advantageous design, the bead 18 of the centrifuge rotor consisting of the bowl 16 and the lid 17 is formed on the side opposite the bottom of the nozzle.

This ensures that the diameter in which the nozzle holes are provided is not limited by the annular chamber 27, which must be left open for the corresponding holding of the beads. The nozzle thus has a lever arm that is approximately 25% larger in outer diameter and area of use, for example in a passenger car (PKW), and thereby produces a correspondingly higher torque and rotational speed. This improves the degree of separation.

According to an advantageous further development, the loose shaft 5 is fixed by means of a fixing member 28.

This allows the bearing to be almost completely inside the inner tube. This is because the inner pipe is supported in the lid without beading. The advantage of this configuration is that dirt and chips that occur when the bearing is rubbed and could not be practically completely washed away when the finished pipe is processed are delivered together with the centrifuge as dirt on the ground. There is no point. at the same time,
Not beaded, it is cheaper and is superior to the beaded variant in terms of dimensional stability. Depending on the information at that time, the fixing member may be arranged above, below, or both above and below.

Furthermore, according to another advantageous design, a hollow body 29, in particular made of plastic, is inserted in the centrifuge rotor.

The hollow body removes dirt originating from the rotor and adhering in the form of a viscous, sticky annular outer casing. Since the dirt 30 adheres to the hollow body, it can be discarded together with the hollow body by opening the rotor.

According to a further advantageous embodiment, the centrifuge rotor can be opened via the closing mechanism 32 and has a plastic hollow body inside.

[0022]

The features mentioned above and other features of the advantageous construction of the invention are obtained in addition to the subject matter of the claims.
It will be apparent from the following description of the drawings. The individual features are then, individually or in combination, embodied as an embodiment of the invention or in other fields and are also in an advantageous, independently protectable form. Protecting against these forms is claimed herein. Hereinafter, a plurality of embodiments of the present invention will be described in detail with reference to the drawings.

The filter module shown in FIGS. 1 and 2 comprises a housing 1, a mainstream filter 2 having a bypass valve 3, an oil cooler 4, a centrifuge in a sidestream supported on an upright shaft 5, a minimum pressure adjustment. It is composed of a combination valve 7 of a valve and a cutoff valve. This valve 7 is arranged on the unpurified oil side.

The piston 8 of the valve 7 is loaded with pressure oil via the bore 9. The preloaded spring 10 acts against the generated pressure. The valve is evacuated from the hole 14 on the spring side. At a pressure of about 1.5-2 bar depending on the configuration, the piston is moved to open the hollow centrifuge shaft and the oil supply port 11 to the centrifuge. The pressure increases as the engine speed increases. Piston is about 5 bar with another side hole 1
Open two. This lateral hole 12 leads to a pressureless discharge cross section 13 of the centrifuge. This limits the maximum hydraulic pressure,
The valve moves to the cut-off position and the additionally supplied volumetric flow is discharged without pressure from the discharge cross section of the centrifuge. In that case, the cover 15 directs the oil flow directly into the outlet cross section. In this configuration, two individual valves are replaced by a single two-stage valve.

The rotor in the centrifuge has a bowl-shaped body 16 and a lid 17.
And consists of. Both members 16 and 17 are joined together via a bead 18. The intermediate bottom portion 19 separates the dirt chamber 20 and the oil / nozzle chamber 21. The inner tube 22 receives two plain bearings 23, 24 bearing the rotor on the shaft 5.

The shaft 5 made of a tube is inserted into the housing pot-like body 36, and is simultaneously supported and sealed while suppressing vibration by the seal plug 25 made of elastomer and the ring 26 made of elastomer. ing. In the case of the single variation, elastomer rings are used at both ends.

The bead 18 is provided on the side of the centrifuge opposite to the bottom of the nozzle. This prevents the diameter at which the nozzle holes are provided from being narrowed by the annular chamber 27, which must be left open for the corresponding holding part of the bead. The nozzle therefore has its outer and passenger cars (PK
With respect to the size of W), it has a lever arm which is about 25% larger, which correspondingly increases the torque and the rotational speed and consequently improves the degree of separation.

For example, one end of the inner tube is not beaded in the centrifuge bowl having a lid, and the fixing member 28 is used.
Is fixed through. In a variant of the centrifuge rotor, dirt that adheres in the form of viscous annular deposits can be removed from the rotor. For the purpose of removal, a hollow plastic body 29 is inserted in the rotor instead of the intermediate plate bottom 19, which can be manufactured conventionally in two parts or integrally by blow molding. Dirt deposits 30
Adheres to this hollow body and can be removed with the plastic part by opening the rotor.

For this purpose, the rotor is constructed so that it can be opened and closed and the pot 16 and lid 17 are not beaded. The lid 17 is held in the bowl-shaped body against internal pressure via a circular wire ring 32 fitted in the groove 31. Since this ring 32 is removable, the lid can be removed in the same way after the fixing member 28 has been removed.
The O-ring 33 seals the next joint and seals the oil chamber.

The reaction nozzle provided at the centrifuge rotor and its construction are important to the high rate of the centrifuge.
For cost reasons, the nozzle hole type must be very simple for this thin plate centrifuge rotor. The nozzle holes are therefore advantageously stamped out from the outside.
When the flash is removed, a velocity coefficient ψ of about 0.96 is obtained, and a correspondingly high reaction force is obtained. Of course, when the punching flash occurs inside the nozzle hole, the velocity coefficient ψ decreases to about 0.7.

As a countermeasure, here, the blind rivet 35 is inserted as a nozzle into the punched nozzle hole 34. Undeformed rivets 36 are set into the tacks, as is commonly done with this technique. The outer diameter of this tack matches the target inner diameter of the finished nozzle. After inserting the rivet into the rivet into the push-out hole of the centrifuge bowl from the outside, insert the rivet head inside and rivet head 38
It is molded by tightening the studs onto the corresponding holding parts via. Proper formation of this rivet will provide the appropriate inlet geometry for the nozzle. When the inner rivet head is formed, the notch stress of the tack increases and the tack breaks at the target break point 39. Subsequently, the portion left in the finished nozzle is extruded inward through the assembly device. With the nozzle thus formed, about 0.
A speed factor ψ of 98 is obtained.

[Brief description of drawings]

[Figure 1] Side flow centrifuge and bottom pressure adjustment valve on the unpurified oil side
It is the figure which showed the lubrication circuit which has a combination valve of a cutoff valve.

2 is a cross-sectional view of the device of FIG.

FIG. 3 is a cross-sectional view of a centrifuge rotor and its supporting portion.

FIG. 4 is a view of a centrifuge rotor having hollow bodies inserted therein.

FIG. 5 is a diagram showing a modified form of a nozzle.

FIG. 6 is a diagram showing another variation of the nozzle.

[Explanation of symbols]

 1 Housing 2 Mainstream Filter 3 Bypass Valve 4 Oil Cooler 5 Shaft 6 Centrifuge 7 Cutoff Valve 8 Piston 9 Hole 10 Spring 11 Oil Supply Hole 12 Horizontal Hole 13 Discharge Cross Section 16 Bowl 17 17 Lid 19 Middle Bottom 20 Dirt Chamber 23, 24 Sliding bearing 25 Seal plug 26 Elastomer ring 27 Annular chamber 28 Fixing member 29 Hollow body 30 Dirty deposit 31 Groove 33 O-ring 34 hole 36 Rivet 37 Tack 39 Target break point

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁶ Identification number Internal reference number FI Technical display location F01M 11/03 J (72) Inventor Hans Eltmannsdelfer, Federal Republic of Germany Dobel Panorama Straße 2 (72) Inventor Martin Schetter Germany Bezigheim Fleuerweg 7 (72) Inventor Martin Weindorf Kornwestheim Saarstraße 7

Claims (17)

[Claims] 1. Device for adjusting the minimum responsive pressure of a centrifuge and maintaining the maximum pressure in the entire fluid circuit in a hydraulic fluid circuit having a mainstream filter and a centrifuge, in particular arranged in a sidestream. Is disposed between the mainstream filter and the centrifuge, the fluid circuit having the mainstream filter. 2. Fluid circuit according to claim 1, characterized in that the adjustment of the minimum responsive pressure of the centrifuge and the maximum pressure in the fluid circuit is carried out via a valve. 3. The fluid circuit of claim 1, wherein the valve has at least two staggered holes. 4. The valve has a third vent, which vent opens to a pressureless fluid chamber,
The fluid circuit according to claim 3. 5. The fluid circuit according to claim 1, wherein the first hole is connected to the centrifuge shaft via a fluid passage. 6. Fluid circuit according to claim 5, characterized in that the second hole is connected to the fluid reservoir via a return line, preferably via a centrifuge drain line. 7. The fluid circuit according to claim 1, wherein the valve is arranged behind the mainstream filter. 8. A fluid circuit according to any one of claims 1 to 7, characterized in that said valve is arranged in front of the mainstream filter. 9. A fluid circuit according to claim 1, wherein at least one nozzle is constituted by a hollow rivet in the centrifuge rotor. 10. An inner tube of a centrifuge rotor is provided with a collar on one side in the axial direction and the other side is provided with a groove or recess in the tube via axial fastening means, preferably a fastening disc. Claim 1 characterized in that it is fixed without exception.
10. The fluid circuit according to any one of 1 to 9. 11. The fluid according to claim 1, wherein the inner tube of the centrifuge rotor is fixed on both sides in the axial direction via axial fixing means. circuit. 12. The shaft (10) of pipe has a sealing plug (12), preferably made of elastomer, and / or a ring (13), preferably made of elastomer, and the bowl-shaped housing (1)
1) A fluid circuit according to any one of claims 1 to 11, characterized in that it is inserted into. 13. The bead (3) of a centrifuge rotor consisting of a bowl (1) and a lid (2) is provided on the side opposite the nozzle bottom. The fluid circuit according to any one of 12 to 12. 14. Fluid circuit according to claim 1, characterized in that the loose tube (10) is fixed via fixing means (16). 15. Fluid circuit according to claim 1, characterized in that a hollow body (17), in particular made of plastic, is inserted in the centrifuge rotor. 16. The hollow plastic body at the same time forms the middle bottom (4) of the centrifuge, whereby the middle bottom is not required as a single piece. The fluid circuit according to claim 1. 17. The centrifuge rotor is openable (Oeffnbar) via a closing mechanism (21) and also comprises a plastic hollow body (17) therein. 16. The fluid circuit according to any one of up to 16.